GeezerVison

I think you could make this test more clear by making it more explicit:

expect_equal(skipped_stack[[1]], quote(f(1)))

Or even:

expect_equal(skipped_stack, list(quote(f(1)), quote(stop(x))))

That illustrates a subtle problem somewhere in the stack because if you print skipped_stack you see:

[[1]]
f(1)

[[2]]
function(x) stop(x)

Because the srcref is out of sync with the actual contents of the element.